Rotary direct drive servo valve and method of regulating same

Abstract

A rotary direct-drive servo valve and its adjustment method are disclosed, relating to the field of electro-hydraulic servo valve technology. This invention solves the problems of high processing and maintenance costs, large internal leakage, and complex structure in existing servo valves. In this invention, the sensor end cap, fixed flange, and valve body are sequentially connected from top to bottom. The valve sleeve is installed on the valve body via a threaded connection. The opening end of the sealing cover is coaxially fitted onto the end of the valve sleeve. The valve core is coaxially inserted into the inner holes of the valve sleeve and the sealing cover. The valve core is rotatably connected to the valve sleeve connection portion of the valve sleeve and the sealing cover, respectively. The motor rotor is fixedly installed on the outer wall of the valve core connection portion of the valve core, and the motor stator is fixedly installed on the inner wall of the valve body. The motor rotor and motor stator are arranged correspondingly. A magnet is installed in a groove at the end of the valve core. A magnetic angle sensor module is fixedly installed on the fixed flange, with the magnet and magnetic angle sensor module positioned opposite each other. This invention is used to avoid servo valve leakage, reduce radial friction during valve core rotation, and improve the energy efficiency of the servo valve.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic servo valve technology, specifically to a rotary direct-drive servo valve and its adjustment method. Background Technology

[0002] Servo valves, as key components in hydraulic control systems, are hydraulic control valves that receive analog electrical signals and output modulated flow and pressure accordingly. They offer advantages such as fast response and high control precision, and are widely used in aerospace, robotics, and other fields. However, traditional servo valves, employing spool valve, nozzle-baffle, and jet pipe designs, suffer from drawbacks such as complex structure, large internal leakage, difficult debugging, and high processing and maintenance costs, limiting their application in general industrial scenarios and in manufacturers with high energy efficiency requirements. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of high processing and maintenance costs, large internal leakage, and complex structure of existing servo valves, and to provide a rotary direct-drive servo valve and its adjustment method.

[0004] The technical solution of this invention is:

[0005] A rotary direct-drive servo valve includes a valve body assembly 1, a motor assembly 2, and a system sensing module 3. The valve body assembly 1 includes a valve sleeve 101, a valve core 102, a sealing cover 107, a valve body 108, a fixed flange 112, a sensor end cap 113, and a cable guide ring 114. The sensor end cap 113, the fixed flange 112, and the valve body 108 are connected sequentially from top to bottom via connecting elements 1111. A threaded connection hole is machined at the center of the end of the valve body 108. A cable assembly through hole is machined at the center of the end of the sensor end cap 113, and a cable guide ring 114 is installed inside the cable assembly through hole. External threads are machined on the outside of the valve body 108. The servo valve is connected to the external hydraulic system via the external thread of the valve body 108. The valve sleeve 101 has an annular structure and consists of a valve sleeve connecting part and a valve sleeve cylindrical part connected coaxially from top to bottom. The valve sleeve connecting part of the valve sleeve 101 is threaded onto the valve body 108. The sealing cover 107 is a hollow cylindrical structure with one open end. The open end of the sealing cover 107 is coaxially fitted onto the end of the valve sleeve connecting part of the valve sleeve 101. The valve core 102 has a hollow structure and consists of a valve core connecting part and a valve core cylindrical part connected coaxially from top to bottom. The valve core 102 is coaxially inserted into the valve sleeve 108 from top to bottom. 1. In the inner hole of the sealing cover 107, the valve core connecting part of the valve core 102 is rotatably connected to the valve sleeve connecting part of the valve sleeve 101 and the sealing cover 107 through bearings I105 and II106 respectively. The motor assembly 2 includes a motor stator 201 and a motor rotor 202. The motor rotor 202 is located inside the sealing cover 107 and is fixedly installed on the outer wall of the valve core connecting part of the valve core 102. The motor stator 201 is located inside the valve body 108 and is fixedly installed on the inner wall of the valve body 108. The motor rotor 202 and the motor stator 201 are arranged correspondingly. The system sensing module 3 includes a magnet 301. The magnetic angle sensor module 302 and the servo valve cable 303 are included. The magnet 301 is located inside the sealing cover 107 and is installed in the groove at the end of the valve core connection part of the valve core 102. The magnetic angle sensor module 302 is located between the fixed flange 112 and the sensor end cover 113. The magnetic angle sensor module 302 is fixedly installed on the fixed flange 112 through two connecting elements II 110. The magnet 301 is arranged opposite to the magnetic angle sensor module 302. The servo valve cable 303 is fixed to the sensor end cover 113 through the wire guide ring 114. The end of the servo valve cable 303 is connected to the magnetic angle sensor module 302.

[0006] Furthermore, the cylindrical portion of the valve sleeve 101 is isolated into three valve sleeve oil chambers by four pairs of shoulders. The three valve sleeve oil chambers, from top to bottom, are oil chamber B 401, oil chamber P 402, and oil chamber A 403. Oil chamber P 402 is connected to the external oil outlet pipeline, and oil chamber A 403 and oil chamber B 401 are respectively connected to the two oil circuits of the load.

[0007] Furthermore, the A oil cavity 403 of the valve sleeve 101 is machined with A oil cavity throttling ports IA1, IIA1′, IIIA2 and IVA2′ arranged symmetrically in a circle; the B oil cavity 401 of the valve sleeve 101 is machined with B oil cavity throttling ports IB1, IIB1′, IIIB2 and IVB2′ arranged symmetrically in a circle; the P oil cavity 402 of the valve sleeve 101 is machined with P oil cavity outlets IP1, IIP2, IIIP3 and IVP4 arranged evenly in a circle.

[0008] Furthermore, a T-shaped oil cavity 404 is machined on the valve core 102, and the T-shaped oil cavity 404 is connected to the external oil return pipeline.

[0009] Furthermore, valve core 102 is machined with valve core flow grooves IC1, IIC1′, IIIC2, and IVC2′ arranged symmetrically in a circle. One end of valve core flow grooves IC1, IIC1′, IIIC2, and IVC2′ communicates with P oil cavity 402 through P oil cavity outlets IP1, IIP2, IIIP3, and IVP4, respectively. Valve core 102 is also machined with valve core throttling ports ID1, IID1′, IIID2, and IVD2′ arranged symmetrically in a circle. All three throttling ports ID1, IID1′, IIID2, and IVD2′ communicate with T oil cavity 404 of valve core 102.

[0010] Furthermore, the valve core flow groove IC1 and valve core throttling port ID1, the valve core flow groove ⅡC1′ and valve core throttling port ⅡD1′ are aligned axially; the valve core flow groove ⅢC2 and valve core throttling port ⅢD2, the valve core flow groove IVC2′ and valve core throttling port IVD2′ are aligned axially; the A oil chamber throttling port IA1 and the B oil chamber throttling port IB1, the A oil chamber throttling port ⅡA1′ and the B oil chamber throttling port ⅡB1′ are aligned axially; the A oil chamber throttling port ⅢA2 and the B oil chamber throttling port ⅢB2, the A oil chamber throttling port IVA2′ and the B oil chamber throttling port IVB2′ are aligned axially.

[0011] Furthermore, the valve body assembly 1 also includes a sealing ring I104, and the valve sleeve connection part of the valve sleeve 101 and the sealing cover 107 are statically sealed by the sealing ring I104.

[0012] Furthermore, the valve body assembly 1 also includes two sealing rings II 109, which seal the space between the fixed flange 112 and the sensor end cap 113, and between the fixed flange 112 and the valve body 108.

[0013] Furthermore, the valve body assembly 1 also includes a disc spring 103, which is installed in the groove at the end of the valve sleeve connection portion of the valve sleeve 101. The two ends of the disc spring 103 abut against the inner and outer ring end faces of the bearing I105 and the bottom surface of the groove, respectively.

[0014] Based on the adjustment method of the rotary direct-drive servo valve described in Specific Embodiment Nine, the adjustment method of the rotary direct-drive servo valve is implemented through the following steps:

[0015] Step 1: Adjustment process for the load to move in the positive direction:

[0016] The valve core 102 rotates radially within the valve sleeve 101. When the valve core 102 rotates a certain angle, the valve core throttling port ID1 and valve core throttling port IID1′ on the valve core 102 coincide with the positions of the B oil cavity throttling port IB1 and B oil cavity throttling port IIIB1′ on the B oil cavity 401 on the valve sleeve 101, so that the B oil cavity 401 communicates with the T oil cavity 404. At the same time, the other end of the valve core flow groove IC1 and valve core flow groove IIC1′ on the valve core 102 coincides with the positions of the A oil cavity throttling port IA1 and A oil cavity throttling port IIA1′ on the A oil cavity 403 on the valve sleeve 101, so that the A oil cavity 403 communicates with the P oil cavity 402. At this time, the load moves in one direction, and the speed of the movement is determined by the degree of position overlap.

[0017] Step 2: Adjustment process for the load to move in the opposite direction:

[0018] The valve core 102 rotates radially within the valve sleeve 101. After the valve core 102 rotates a certain angle, the valve core throttling port ⅢD2 and the valve core throttling port IVD2′ on the valve core 102 coincide with the positions of the A oil cavity throttling port ⅢA2 and the A oil cavity throttling port IVA2′ on the A oil cavity 403 on the valve sleeve 101, so that the A oil cavity 403 communicates with the T oil cavity 404. At the same time, the other end of the valve core flow groove ⅢC2 and the valve core flow groove IVC2′ on the valve core 102 coincides with the positions of the B oil cavity throttling port ⅢB2 and the B oil cavity throttling port IVB2′ on the B oil cavity 401 on the valve sleeve 101, so that the B oil cavity 401 communicates with the P oil cavity 402. At this time, the load moves in the opposite direction, and the speed of the movement is determined by the degree of position overlap.

[0019] Step 3: Adjustment process when the servo valve is in the neutral position:

[0020] The valve core 102 rotates radially within the valve sleeve 101. After the valve core 102 rotates a certain angle, the throttling port on the valve core 102 does not coincide with the throttling ports of oil chambers A 403 and B 401 on the valve sleeve 101, so that oil chambers A 403 and B 401 are not connected to oil chamber T 404. At the same time, the other end of the flow groove on the valve core 102 does not coincide with the throttling port on the valve sleeve 101, so that oil chambers A 403 and B 401 are not connected to oil chamber P 402. At this time, the servo valve is in the neutral position.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. This invention adopts a screw-in cartridge valve structure design, with fewer valve body components and an integrated design of the motor rotor and valve core, which has the advantages of small size, compact structure, simple assembly and high degree of integration.

[0023] 2. This invention uses a single sealing ring to achieve sealing between the valve core, valve sleeve, and valve body, eliminating dynamic sealing and preventing leakage. At the same time, it greatly reduces the radial friction force when the valve core rotates, thus improving the energy efficiency of the servo valve.

[0024] 3. This invention adopts a rotary valve core design. The valve core is driven to rotate relative to the valve sleeve by the motor rotor, realizing the opening and closing and reversal between the A and B oil chambers and the P and T oil chambers, giving it a three-position four-way function. By controlling the rotation angle of the valve core, the overlap of the throttling port on the valve core and the valve sleeve is controlled, realizing precise linear control of the flow rate and improving the control accuracy of the servo valve.

[0025] 4. The present invention has throttling ports and oil outlets arranged symmetrically in a circle on the valve sleeve, and throttling ports and flow grooves arranged symmetrically in a circle on the valve core. Furthermore, the throttling ports and flow grooves are aligned in an orderly manner in the axial direction, thereby achieving hydraulic balance when the valve core rotates and reducing the rotational resistance of the motor rotor. Attached Figure Description

[0026] Figure 1 This is an assembly drawing of a rotary direct-drive servo valve and its adjustment method according to the present invention;

[0027] Figure 2 This is an assembly drawing of valve body assembly 1 of a rotary direct-drive servo valve and its adjustment method according to the present invention;

[0028] Figure 3 This is an assembly drawing of the motor assembly 2 of a rotary direct-drive servo valve and its adjustment method according to the present invention;

[0029] Figure 4 This is an assembly drawing of the system sensing module 3 of a rotary direct-drive servo valve and its adjustment method according to the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a rotary direct-drive servo valve and its adjustment method according to the present invention;

[0031] Figure 6 This is an unfolded view of the cylindrical part of the valve sleeve 101 in the present invention, which describes a rotary direct-drive servo valve and its adjustment method.

[0032] Figure 7 This is an unfolded view of the cylindrical portion of the valve core 102 in a rotary direct-drive servo valve and its adjustment method according to the present invention.

[0033] Figure 8 This is a schematic diagram of a rotary direct-drive servo valve and its adjustment method in the first working state according to the present invention;

[0034] Figure 9 This is a schematic diagram of a rotary direct-drive servo valve and its adjustment method in the second working state according to the present invention;

[0035] Figure 10 This is a schematic diagram of a rotary direct-drive servo valve and its adjustment method in the neutral position according to the present invention.

[0036] In the diagram: 1-Valve body assembly; 2-Motor assembly; 3-System sensing module; 101-Valve sleeve; 102-Valve core; 103-Disc spring; 104-Sealing ring I; 105-Bearing I; 106-Bearing II; 107-Sealing cover; 108-Valve body; 109-Sealing ring II; 110-Connecting element II; 111-Connecting element I; 112-Fixing flange; 113-Sensor end cap; 114-Wire guide ring; 401-B oil chamber; 402-P oil chamber; 403-A oil chamber; 404-T oil chamber; A1-A oil chamber throttle port I; A1′-A oil chamber throttle port II; A2 -A oil chamber throttling port Ⅲ; A2′-A oil chamber throttling port IV; B1-B oil chamber throttling port I; B1′-B oil chamber throttling port Ⅱ; B2-B oil chamber throttling port Ⅲ; B2′-B oil chamber throttling port IV; P1-P oil chamber outlet I; P2-P oil chamber outlet Ⅱ; P3-P oil chamber outlet Ⅲ; P4-P oil chamber outlet IV; C1-valve core flow groove I; C1′-valve core flow groove Ⅱ; C2-valve core flow groove Ⅲ; C2′-valve core flow groove IV; D1-valve core throttling port I; D1′-valve core throttling port Ⅱ; D2-valve core throttling port Ⅲ; D2′-valve core throttling port IV. Detailed Implementation

[0037] Specific implementation method one: Combining Figures 1 to 10This embodiment describes a rotary direct-drive servo valve, which includes a valve body assembly 1, a motor assembly 2, and a system sensing module 3. The valve body assembly 1 includes a valve sleeve 101, a valve core 102, a sealing cover 107, a valve body 108, a fixed flange 112, a sensor end cover 113, and a cable guide ring 114. The sensor end cover 113, the fixed flange 112, and the valve body 108 are connected sequentially from top to bottom via connecting elements I111. A valve body threaded connection hole is machined at the center of the end of the valve body 108. A cable assembly through hole is machined at the center of the end of the sensor end cover 113. A cable guide ring 114 is installed in the cable assembly through hole. The valve body 108 has external threads, and the rotary direct-drive servo valve is connected to the external hydraulic system through the external threads of the valve body 108. The valve sleeve 101 has an annular structure and consists of a valve sleeve connecting part and a valve sleeve cylindrical part connected coaxially from top to bottom. The valve sleeve connecting part of the valve sleeve 101 is installed on the valve body 108 by a threaded connection. The sealing cover 107 is a hollow cylindrical structure with one end open. The open end of the sealing cover 107 is coaxially fitted onto the end of the valve sleeve connecting part of the valve sleeve 101. The valve core 102 has a hollow structure and consists of a valve core connecting part and a valve core cylindrical part connected coaxially from top to bottom. The valve core 102 is coaxially connected from top to bottom. The valve core 102 is inserted into the inner holes of the valve sleeve 101 and the sealing cover 107. The valve core connecting part of the valve core 102 is rotatably connected to the valve sleeve connecting part of the valve sleeve 101 and the sealing cover 107 through bearings I105 and II106 respectively. The motor assembly 2 includes a motor stator 201 and a motor rotor 202. The motor rotor 202 is located inside the sealing cover 107 and is fixedly installed on the outer wall of the valve core connecting part of the valve core 102. The motor stator 201 is located inside the valve body 108 and is fixedly installed on the inner wall of the valve body 108. The motor rotor 202 is arranged correspondingly to the motor stator 201. The system sensing module 3 includes a magnet 3. 01. Magnetic angle sensor module 302 and servo valve cable 303. Magnet 301 is located inside the sealing cover 107. Magnet 301 is installed in the groove at the end of the valve core connection part of valve core 102. Magnetic angle sensor module 302 is located between fixed flange 112 and sensor end cover 113. Magnetic angle sensor module 302 is fixedly installed on fixed flange 112 through two connecting elements II 110. Magnet 301 is arranged opposite to magnetic angle sensor module 302. Servo valve cable 303 is fixed to sensor end cover 113 through wire loop 114. The end of servo valve cable 303 is connected to magnetic angle sensor module 302.

[0038] In this embodiment, the motor stator 201 is mounted on the valve body 108 and fixed by the stepped structure of the valve body 108 and the fixing flange 112. The motor rotor 202 is mounted on the valve core 102 and fixed by the stepped structure of the valve core 102. The motor stator 201 receives motion information from the driver via the servo valve cable 303. The sensor module 302 determines the rotation angle of the valve core 102 by sensing the change in magnetic flux of the magnet 301 and feeds the information back to the controller via the servo valve cable 303.

[0039] Specific Implementation Method Two: Combining Figure 5 and Figure 6 In this embodiment, the cylindrical portion of the valve sleeve 101 is isolated into three valve sleeve oil chambers by four pairs of shoulders. These three oil chambers, from top to bottom, are oil chamber B 401, oil chamber P 402, and oil chamber A 403. Oil chamber P 402 is connected to an external oil outlet pipeline, while oil chambers A 403 and B 401 are respectively connected to two oil circuits of the load. With this configuration, the valve core 102 and valve sleeve 101 divide the oil circuit into oil chambers P 402, T 404, A 403, and B 401. When the motor rotor drives the valve core 102 to rotate radially within the valve sleeve 101, the throttling orifices and flow grooves designed on the valve core 102 and valve sleeve 101 enable the switching and reversing of oil chambers A 403 and B 401 with oil chambers P 402 and T 404, thus providing a three-position four-way function. Other components and connections are the same as in Specific Implementation Method 1.

[0040] Specific implementation method three: Combining Figure 5 and Figure 6 In this embodiment, the valve sleeve 101 has symmetrically arranged throttling ports IA1, IIA1′, IIIA2, and IVA2′ on its A oil chamber 403; symmetrically arranged throttling ports IB1, IIB1′, IIIB2, and IVB2′ on its B oil chamber 401; and symmetrically arranged throttling ports IVB1, IIB1′, IIIB2, and IVB2′ on its P oil chamber 402; and evenly distributed throttling ports IP1, IIP2, IIP3, and IVP4 on its P oil chamber 402. Other components and connections are the same as in specific embodiments one or two.

[0041] Specific implementation method four: Combination Figure 1 This embodiment describes a valve core 102 with a T-shaped oil cavity 404, which is connected to an external return oil pipeline. Other components and connections are the same as in specific embodiments one, two, or three.

[0042] Specific Implementation Method Five: Combining Figure 5 and Figure 7 In this embodiment, the valve core 102 is machined with valve core flow grooves IC1, IIC1′, IIIC2, and IVC2′ arranged symmetrically in a circle. One end of each of the valve core flow grooves IC1, IIC1′, IIIC2, and IVC2′ communicates with the P oil cavity 402 through the P oil cavity outlets IP1, IIP2, IIIP3, and IVP4, respectively. The valve core 102 is also machined with valve core throttling ports ID1, IID1′, IIID2, and IVD2′ arranged symmetrically in a circle. Each of these ports communicates with the T oil cavity 404 of the valve core 102. This configuration ensures that the oil outlet and return lines overlap at the throttle orifice. Other components and connections are the same as in specific implementation methods one, two, three, or four.

[0043] Specific Implementation Method Six: Combination Figure 6 and Figure 7 In this embodiment, the valve core flow groove IC1 and valve core throttling port ID1, and the valve core flow groove IIC1′ and valve core throttling port IID1′ are axially aligned; the valve core flow groove IIIC2 and valve core throttling port IIID2, and the valve core flow groove IVC2′ and valve core throttling port IVD2′ are axially aligned; the A oil chamber throttling port IA1 and the B oil chamber throttling port IB1, the A oil chamber throttling port IIA1′ and the B oil chamber throttling port IIB1′ are axially aligned; the A oil chamber throttling port IIIA2 and the B oil chamber throttling port IIIB2, and the A oil chamber throttling port IVA2′ and the B oil chamber throttling port IVB2′ are axially aligned. Other components and connections are the same as in specific embodiments one, two, three, four, or five.

[0044] Specific implementation method seven: Combination Figure 1 In this embodiment, the valve body assembly 1 further includes a sealing ring I104. The valve sleeve connection portion of the valve sleeve 101 and the sealing cover 107 are statically sealed using the sealing ring I104. With this configuration, only the valve sleeve 101 and the sealing cover 107 are statically sealed using the sealing ring I104, without dynamic sealing, thus preventing leakage. Simultaneously, it significantly reduces the radial friction force during valve core rotation, improving the energy efficiency of the servo valve. Other components and connections are the same as in specific embodiments one, two, three, four, five, or six.

[0045] Specific implementation method eight: Combination Figure 5In this embodiment, the valve body assembly 1 further includes two sealing rings II 109. The fixing flange 112 and the sensor end cap 113, and the fixing flange 112 and the valve body 108 are both sealed by sealing rings II 109. With this configuration, the fixing flange 112, the sensor end cap 113, and the valve body 108 are connected by screws I, and the three are sealed by the two sealing rings II 109. The fixing flange 112 also serves to restrict the axial movement of the sealing cover 107. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, or seven.

[0046] Specific Implementation Method Nine: Combining Figure 5 In this embodiment, the valve body assembly 1 further includes a disc spring 103, which is installed in a groove at the end of the valve sleeve connecting portion of the valve sleeve 101. Both ends of the disc spring 103 abut against the inner and outer ring end faces of the bearing 1105 and the bottom surface of the groove, respectively. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, seven, or eight.

[0047] Specific Implementation Method Ten: Combining Figures 1 to 10 This embodiment describes an adjustment method for a rotary direct-drive servo valve based on Specific Embodiment Nine. This adjustment method for the rotary direct-drive servo valve is implemented through the following steps:

[0048] Step 1: Adjustment process for the load to move in the positive direction:

[0049] Reference Figure 8 The valve core 102 rotates radially within the valve sleeve 101. When the valve core 102 rotates a certain angle, the valve core throttling port ID1 and valve core throttling port IID1′ on the valve core 102 coincide with the positions of the B oil cavity throttling port IB1 and B oil cavity throttling port IIIB1′ on the B oil cavity 401 on the valve sleeve 101, so that the B oil cavity 401 communicates with the T oil cavity 404. At the same time, the other end of the valve core flow groove IC1 and valve core flow groove IIC1′ on the valve core 102 coincides with the positions of the A oil cavity throttling port IA1 and A oil cavity throttling port IIA1′ on the A oil cavity 403 on the valve sleeve 101, so that the A oil cavity 403 communicates with the P oil cavity 402. At this time, the load moves in one direction, and the speed of the movement is determined by the degree of position overlap.

[0050] Step 2: Adjustment process for the load to move in the opposite direction:

[0051] Reference Figure 9The valve core 102 rotates radially within the valve sleeve 101. After the valve core 102 rotates a certain angle, the valve core throttling port ⅢD2 and valve core throttling port IVD2′ on the valve core 102 coincide with the positions of the A oil cavity throttling port ⅢA2 and A oil cavity throttling port IVA2′ on the A oil cavity 403 on the valve sleeve 101, so that the A oil cavity 403 communicates with the T oil cavity 404. At the same time, the other end of the valve core flow groove ⅢC2 and valve core flow groove IVC2′ on the valve core 102 coincides with the positions of the B oil cavity throttling port ⅢB2 and B oil cavity throttling port IVB2′ on the B oil cavity 401 on the valve sleeve 101, so that the B oil cavity 401 communicates with the P oil cavity 402. At this time, the load moves in the opposite direction, and the speed of the movement is determined by the degree of position overlap.

[0052] Step 3: Adjustment process when the servo valve is in the neutral position:

[0053] Reference Figure 10 The valve core 102 rotates radially within the valve sleeve 101. After the valve core 102 rotates a certain angle, the throttling port on the valve core 102 does not coincide with the throttling ports of oil chambers A 403 and B 401 on the valve sleeve 101, so that oil chambers A 403 and B 401 are not connected to oil chamber T 404. At the same time, the other end of the flow groove on the valve core 102 does not coincide with the throttling port on the valve sleeve 101, so that oil chambers A 403 and B 401 are not connected to oil chamber P 402. At this time, the servo valve is in the neutral position.

[0054] Other components and connections are the same as those in embodiments one, two, three, four, five, six, seven, eight, or nine.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary direct-drive servo valve, characterized in that: It includes a valve body assembly (1), a motor assembly (2), and a system sensing module (3). The valve body assembly (1) includes a valve sleeve (101), a valve core (102), a sealing cover (107), a valve body (108), a fixed flange (112), a sensor end cap (113), and a wire guide ring (114). The sensor end cap (113), the fixed flange (112), and the valve body (108) are connected sequentially from top to bottom through a connecting element I (111). A valve body threaded connection hole is machined at the center of the end of the valve body (108), and a cable assembly through hole is machined at the center of the end of the sensor end cap (113). A wire guide ring (114) is installed in the cable assembly through hole. An external thread is machined on the outside of the valve body (108), and a rotary direct drive servo valve is connected to the valve body. The valve body (108) is connected to the external hydraulic system via an external thread. The valve sleeve (101) is an annular structure, consisting of a valve sleeve connecting part and a valve sleeve cylindrical part connected coaxially from top to bottom. The valve sleeve connecting part of the valve sleeve (101) is installed on the valve body (108) via a threaded connection. The sealing cover (107) is a hollow cylindrical structure with one open end. The open end of the sealing cover (107) is coaxially fitted onto the end of the valve sleeve connecting part of the valve sleeve (101). The valve core (102) is a hollow structure, consisting of a valve core connecting part and a valve core cylindrical part connected coaxially from top to bottom. The valve core (102) is coaxially inserted into the inner holes of the valve sleeve (101) and the sealing cover (107) from top to bottom. The valve core (102) is rotatably connected to the valve sleeve (101) and the sealing cover (107) via bearing I (105) and bearing II (106), respectively. The motor assembly (2) includes a motor stator (201) and a motor rotor (202). The motor rotor (202) is located inside the sealing cover (107) and is fixedly installed on the outer wall of the valve core (102) of the valve core. The motor stator (201) is located inside the valve body (108) and is fixedly installed on the inner wall of the valve body (108). The motor rotor (202) is arranged correspondingly to the motor stator (201). The system sensing module (3) includes a magnet (301) and a magnetic angle sensor. The device module (302) and servo valve cable (303) are included. The magnet (301) is located inside the sealing cover (107). The magnet (301) is installed in the groove at the end of the valve core connection part of the valve core (102). The magnetic angle sensor module (302) is located between the fixed flange (112) and the sensor end cover (113). The magnetic angle sensor module (302) is fixedly installed on the fixed flange (112) by two connecting elements II (110). The magnet (301) is arranged opposite to the magnetic angle sensor module (302). The servo valve cable (303) is fixed on the sensor end cover (113) by the wire guide ring (114). The end of the servo valve cable (303) is connected to the magnetic angle sensor module (302).

2. The rotary direct-drive servo valve according to claim 1, characterized in that: The cylindrical part of the valve sleeve (101) is separated into three valve sleeve oil chambers by four pairs of shoulders. The three valve sleeve oil chambers are B oil chamber (401), P oil chamber (402) and A oil chamber (403) from top to bottom. The P oil chamber (402) is connected to the external oil outlet pipeline, and the A oil chamber (403) and B oil chamber (401) are respectively connected to the two oil circuits of the load.

3. A rotary direct-drive servo valve according to claim 2, characterized in that: The valve sleeve (101) has A oil cavity (403) with A oil cavity throttling ports I (A1), A oil cavity throttling port II (A1′), A oil cavity throttling port III (A2) and A oil cavity throttling port IV (A2′) arranged symmetrically in a circle; the valve sleeve (101) has B oil cavity (401) with B oil cavity throttling ports I (B1), B oil cavity throttling port II (B1′), B oil cavity throttling port III (B2) and B oil cavity throttling port IV (B2′) arranged symmetrically in a circle; the valve sleeve (101) has P oil cavity (402) with P oil cavity outlet I (P1), P oil cavity outlet II (P2), P oil cavity outlet III (P3) and P oil cavity outlet IV (P4) arranged evenly in a circle.

4. A rotary direct-drive servo valve according to claim 1 or 3, characterized in that: The valve core (102) is machined with a T-shaped oil cavity (404), which is connected to an external return oil pipeline.

5. A rotary direct-drive servo valve according to claim 4, characterized in that: The valve core (102) is machined with valve core flow grooves I (C1), II (C1′), III (C2), and IV (C2′) arranged symmetrically in a circle. One end of each of the valve core flow grooves I (C1), II (C1′), III (C2), and IV (C2′) passes through oil outlets I (P1), II (P2), and III (P3) of the P oil chamber, respectively. The oil outlet IV (P4) of the P oil chamber is connected to the P oil chamber (402); the valve core (102) is machined with valve core throttling ports I (D1), II (D1′), III (D2) and IV (D2′) arranged symmetrically in a circle, and the valve core throttling ports I (D1), II (D1′), III (D2) and IV (D2′) are all connected to the T oil chamber (404) of the valve core (102).

6. A rotary direct-drive servo valve according to claim 5, characterized in that: The valve core flow groove I (C1) and valve core throttling port I (D1), and the valve core flow groove II (C1′) and valve core throttling port II (D1′) are aligned axially; The valve core flow groove III (C2) and valve core throttling port III (D2), the valve core flow groove IV (C2′) and valve core throttling port IV (D2′) are aligned axially; the A oil chamber throttling port I (A1) and the B oil chamber throttling port I (B1), the A oil chamber throttling port II (A1′) and the B oil chamber throttling port II (B1′) are aligned axially; the A oil chamber throttling port III (A2) and the B oil chamber throttling port III (B2), the A oil chamber throttling port IV (A2′) and the B oil chamber throttling port IV (B2′) are aligned axially.

7. A rotary direct-drive servo valve according to claim 1 or 6, characterized in that: The valve body assembly (1) also includes a sealing ring I (104), and the valve sleeve connection part of the valve sleeve (101) and the sealing cover (107) are statically sealed by the sealing ring I (104).

8. A rotary direct-drive servo valve according to claim 7, characterized in that: The valve body assembly (1) also includes two sealing rings II (109), which seal the connection between the fixed flange (112) and the sensor end cap (113) and between the fixed flange (112) and the valve body (108).

9. A rotary direct-drive servo valve according to claim 8, characterized in that: The valve body assembly (1) also includes a disc spring (103), which is installed in the groove at the end of the valve sleeve connection part of the valve sleeve (101). The two ends of the disc spring (103) abut against the inner and outer ring end faces of the bearing I (105) and the bottom surface of the groove, respectively.

10. A method for adjusting a rotary direct-drive servo valve according to claim 9, characterized in that: The adjustment method of the rotary direct-drive servo valve is achieved through the following steps: Step 1: Adjustment process for the load to move in the positive direction: The valve core (102) rotates radially within the valve sleeve (101). After the valve core (102) rotates a certain angle, the valve core throttling port I (D1) and valve core throttling port II (D1′) on the valve core (102) coincide with the positions of the B oil chamber throttling port I (B1) and B oil chamber throttling port II (B1′) on the B oil chamber (401) of the valve sleeve (101), respectively, so that the B oil chamber (401) and the T oil chamber (404) are aligned. At the same time, the other ends of the valve core flow groove I (C1) and valve core flow groove II (C1′) on the valve core (102) coincide with the positions of the A oil cavity throttle port I (A1) and A oil cavity throttle port II (A1′) of the A oil cavity (403) on the valve sleeve (101), so that the A oil cavity (403) and the P oil cavity (402) are connected. At this time, the load moves in one direction, and the speed of movement is determined by the degree of position overlap. Step 2: Adjustment process for the load to move in the opposite direction: The valve core (102) rotates radially within the valve sleeve (101). After the valve core (102) rotates a certain angle, the valve core throttling port III (D2) and valve core throttling port IV (D2′) on the valve core (102) coincide with the positions of the A oil chamber throttling port III (A2) and A oil chamber throttling port IV (A2′) on the A oil chamber (403) of the valve sleeve (101), so that the A oil chamber (403) and the T oil chamber (404) are aligned. The valve core (102) and valve core flow groove III (C2) and valve core flow groove IV (C2′) on the valve core (102) are connected, and the other ends of the valve core flow groove III (B2) and valve core flow groove IV (B2′) on the valve sleeve (101) are respectively aligned with the B oil chamber (401) throttle port III (B2) and B oil chamber throttle port IV (B2′) on the valve sleeve (101), so that the B oil chamber (401) and the P oil chamber (402) are connected. At this time, the load moves in the opposite direction, and the speed of movement is determined by the degree of position overlap. Step 3: Adjustment process when the servo valve is in the neutral position: The valve core (102) rotates radially within the valve sleeve (101). When the valve core (102) rotates a certain angle, the throttling port on the valve core (102) does not coincide with the throttling port positions of oil chamber A (403) and oil chamber B (401) on the valve sleeve (101), so that oil chamber A (403), oil chamber B (401) and oil chamber T (404) are not connected. At the same time, the other end of the flow groove on the valve core (102) does not coincide with the throttling port position on the valve sleeve (101), so that oil chamber A (403), oil chamber B (401) and oil chamber P (402) are not connected. At this time, the servo valve is in the neutral position.

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